Paddy dehydration by adsorption: Thermo-physical properties and diffusion model of agriculture residues

Tirawanichakul, Supawan; Tirawanichakul, Yutthana; Sniso, E.

doi:10.1016/j.biosystemseng.2007.11.001

Cited by 12 publications

(9 citation statements)

References 9 publications

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“…The average porosity was 64.20% for the long grain rice husk, 73.23% for the short grain rice husk, 70.45% for the cascara de arroz rice husk and 63.64% for the japonica rice husk. These values are similar to the value of 64.08% (calculated from the apparent density and real density) presented by Velez et al (2009) for the rice husk from Colombia but lower than the value of 75% reported by Subramanian et al (2011) for the rice husk from India, the values of 75.4-75.6% represented by Zhou et al (2009) and Fang et al (2004) for the rice husks from China and the values of 94.22-98.42% reported by Tirawanichakul et al (2008) for the rice husk from Thailand.…”

Section: Ajassupporting

confidence: 84%

Physical Properties of Rice Residues as Affected by Variety and Climatic and Cultivation Onditions in Three Continents

Zhang

Ghaly

Li³

2012

American Journal of Applied Sciences

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Rice husk and straw are by-products of rice cultivation and processing industry and can be used as an energy source. Proper understanding of the physical properties of rice residues is necessary for utilizing them in thermochemical conversion processes such as gasification and combustion. The physical properties (moisture content, particle size, bulk density and porosity) of rice husks and straws obtained from three countries (Egypt, Cuba and China) were evaluated in this study. The moisture contents of rice husks and straws were in the ranges of 4.60-6.07% and 6.58-6.92%, respectively. For all rice varieties tested, the moisture content of the straws was higher than these of the husks. The particle sizes of rice husks and straws were in the ranges of 0.212-0.850 mm and 0-0.710 mm, respectively. All the rice husk varieties had a normal distribution of particle size around the main value of 0.6 mm while the particle size distribution for the rice straws showed a decreasing trend, the larger the particle size the higher was the weight percentage. The bulk density of rice husks and straws were in the ranges of 331.59-380.54 kg m -3 and 162. 03-194.48 kg m -3 , respectively. The bulk density values of rice straws were lower than those of rice husks. A negative linear relationship between the bulk density and the average particle size was observed for rice husks and straws. The porosity of rice husks and straws were in the ranges of 63.64-68.94% and 71.21-85.28%, respectively. A positive linear relationship between the porosity and the average particle size was observed for rice husks and straws. Also, a negative linear relationship between the porosity and the bulk density was observed. The results obtained from this study showed significant differences in the physical properties of the rice husks and straws collected from different countries (located in three different continents). These differences may be due to variations in climatic conditions, soil type, methods of cultivation and type of fertilizer used. The results also indicated that different parts of rice plant (straw and husk) had different physical properties. Also, significant differences were observed among rice varieties even though they were grown under the same climatic conditions using same soil type and cultivation method as in the case of the long and short grain rice variety of Egypt.

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Section: Ajassupporting

confidence: 84%

Physical Properties of Rice Residues as Affected by Variety and Climatic and Cultivation Onditions in Three Continents

Zhang

Ghaly

Li³

2012

American Journal of Applied Sciences

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“…13 1.52 to 3.67 × 10 −10 m 2 /s for rubber wood sawdust drying at 40−60 °C; 14 1 to 10 × 10 −10 m 2 /s and 1 to 6 × 10 −8 m 2 /s for agriculture residues (rice husk and coconut husk, respectively) drying at 30−70 °C. 15 The activation energy was determined by eq 6. A linear relationship between ln(D eff ) and 1/(T + 273.15) is presented in Figure 6 due to the Arrhenius type dependence.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, the drying characteristics of biological materials have been extensively studied by numerical simulation methods or empirical mathematical models under isothermal conditions. − However, these existing methods may not be suitable for the determination of the drying kinetics and effective moisture diffusivity of powdered biomass particles. On one hand, achieving isothermal drying conditions is usually difficult and in some cases impossible.…”

Section: Introductionmentioning

confidence: 99%

Drying Kinetics of Rice Straw under Isothermal and Nonisothermal Conditions: A Comparative Study by Thermogravimetric Analysis

2012

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A thermogravimetric approach was applied to study the drying of powdered rice straw particles to determine the drying kinetics under isothermal and nonisothermal drying conditions. The isothermal drying experiments were performed at 50, 60, 70, and 80 °C, and the nonisothermal drying experiments were performed at a heating rate of 10 °C/min from 30 to 140 °C. The thermogravimetric approach was suitable for determining the effective moisture diffusivity and drying kinetics due to its online weight recording and minimal material requirements as well as its capacity for precise temperature control. The drying process under both conditions mainly occurred during the falling rate period. However, the trend of water loss in rice straw under nonisothermal conditions was different from that under isothermal conditions, especially in terms of the drying rate and the final moisture content. Four widely used models were chosen to describe the isothermal drying process, and their corresponding nonisothermal models were obtained for describing the observed nonisothermal drying behavior. The results of model fitting showed that the logarithmic model was the best model for describing isothermal drying, whereas the nonisothermal Henderson model had the best fit for results obtained under nonisothermal conditions. The effective moisture diffusivity varied from 4.35 × 10 −8 to 5.13 × 10 −8 m 2 /s, and the drying activation energy values were 5.3 and 6.5 kJ/mol under isothermal drying conditions and nonisothermal drying conditions, respectively.

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“…Despite this the Chung and Pfost model has found applicability for description of many experimental data (Barrozo et al, 2008;Basu et al, 2006;Iguaz & Vírseda, 2007;Samapundo et al, 2007;Tirawanichakul et al, 2008).…”

Section: Chung and Pfost Modelmentioning

confidence: 95%

“…His model has been widely applied in the food science to description of water sorption data (Basu, Shivhare, & Mujumdar, 2006;García-Pérez, Cárcel, Clemente, & Mulet, 2008;Goula, Karapantsios, Achilias, & Adamopoulos, 2008;Sinija & Mishra, 2008;Tirawanichakul, Tirawanichakul, & Sniso, 2008). Eq.…”

Section: Studied Modelsmentioning

confidence: 99%

Searching the most optimal model of water sorption on foodstuffs in the whole range of relative humidity

Furmaniak¹,

Terzyk²,

Gołembiewski³

et al. 2009

Food Research International

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Paddy dehydration by adsorption: Thermo-physical properties and diffusion model of agriculture residues

Cited by 12 publications

References 9 publications

Physical Properties of Rice Residues as Affected by Variety and Climatic and Cultivation Onditions in Three Continents

Physical Properties of Rice Residues as Affected by Variety and Climatic and Cultivation Onditions in Three Continents

Drying Kinetics of Rice Straw under Isothermal and Nonisothermal Conditions: A Comparative Study by Thermogravimetric Analysis

Searching the most optimal model of water sorption on foodstuffs in the whole range of relative humidity

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